# Questions tagged [motor]

An electrical actuator that converts electrical energy into rotational motion or sustained linear motion (linear motor). There are many types of electric motors. If the specific type of motor is known, it is helpful to use or add a more specific tag, such as dc-motor, brushless-dc motor or induction-motor.

2,154 questions
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### 3d lazer smoke projector [on hold]

I've discovered if you shake a green lazer diode rapidly and blow smoke it creates an animation which is really cool. The problem is your arm gets tired fast right about when it starts looking really ...
526 views

### Inner structure of a bipolar stepper motor?

The classic diagram looks like this with coils just positioned sideways to the rotation I'm not sure if this is just a schematic or it indicates the actual structure. However I assume the actual ...
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### Flux and inductance in simple motor

This is the front view of a cylindrical motor of depth (or height) $D$. There are three windings: $\alpha$ (stator), $\beta$ (stator) and $\gamma$ (rotor): Considering the core to be of ...
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### How to convert capacitor start motor to capacitor run motor [on hold]

how to convert capacitor start motor to capacitor run motor.
511 views

### Using a PNP transistor as a switch connected from a 74154 then out to stepper motors

I am currently working on a project that involves an arduino mega 2560, one 74154 demux and 16 stepper motors. I want to be able to control which stepper motor turns at a given time. For this, the ...
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### What's the best starting point for rotor angle estimation for FOC?

I'm driving a BLDC motor with FOC. Right now, I have Space Vector modulation working, where I can give it a magnitude and an angle, and the algorithm will drop the right values into three PWM ...
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### Pre charge resistor switch

I have a 12V 40A motor. I have a switch between the motor controller and the battery. I want to put a pre charge resistor in the path. Like in the figure. My questions are: 1) The pre charge ...
43 views

### Washing machine problem [on hold]

I have the following washing machine. - it rotates in one direction but it need help with my hand - the other direction it doesn't rotate at all - the mechanical timer works very well Can ...
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### what would happen if I used a rheostat in series with a motor to drop my 230v ac supply to 110v ac?

I realize that I would be running higher (a little more than double) current through the motor I'm just curious if it would damage my motor? The motor is a 1 hp, 110V/60Hz driving a meat grinder.
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### BLDC startup algorithm

How do real world algorithms for sensorless BLDC motors handle startup under load? Right now I run phase 1 for a few milliseconds to get the rotor in a known position, the I run open loop for a ...
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### bldc regenerative braking, braking torque

I'm trying to figure out the braking torque calculation for a BLDC simulation. Now if I'm looking at a datasheet I know the torque at a given rpm at acceleration. If I brake with regenerative breaking ...
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### Is there a motor design where a rotor gradually moves into a stater?

I was wondering if there is a motor/generator design where the rotor moves gradually in and out of the stator along the axis of rotation, or the stator over the rotor, but the primary motion is rotary,...
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### Speed limiter - 24v Motors

I'm looking for a way to limit the speed of some wheelchair motors in order to gain better control when using them in my RC device. Currently the motors are very sharp and don't ramp up to speed, ...
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### what is field exitation type of 775 DC motor?

There are different types of field exitation modes. Some of them are Shunt wound series wound and permanent type So, what type of motor is 775 DC motor? i have tried to search the type from ...
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### Frictional Force in a DC Motor

I have wheel that is on an axle running through two supported bearings. In one quadrant of this wheel, there is a (small) mass. As expected, the mass has a bias of being as close to the ground as ...
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### calculation of torque constant based on bldc datasheet, getting different torque constants

I'm trying to get the torque constant of a bldc. Based on this: how to read datasheet I just divide the torque at any given point with the current. I tried out that method with different values and ...
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### Choosing a motor to lift window blinds [duplicate]

I'm looking to raise my blinds every morning using an rpi/Arduino and a motor. The blinds are lifted by a cord that loops near the bottom. I've checked that the cord requires about 20N force to pull ...
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### Motor / VFD / Protective Earth

I have little experience with AC motors since I'm majoring in Mech.E. My team is setting up an AC motor with a VFD to control the movement of an airfoil inside a metal cage we built. I understand the ...
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### Using this 3-phase PM Synchronous AC servo motor with single-phase?

There is a AC Synchronous Servo motor which can work both as 3-phase and single-phase. Here is a general datasheet. These can work both with 3-phase and single phase. I couldn't find what would be ...
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### Average voltage (pwm regulated) out of motor voltage range?

My DC brushed motor is rated 4.5V-15V. My application requires the motor to spin with different speeds so I am using PWM to regulated the it. I will be supplying the motor with a 12V battery and using ...
235 views

### Question about per unit system

I have a set of impedance values for a motor referred to the stator given in per unit where: Vbase_s = Stator line to Line Voltage Pbase_s = Motor rated power Zbase_s = Vbase^2/Pbase Now I want to ...
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### Design of a motor SPDT switch that can be triggered by 5 V or 3.3 V digital output

Problem: I am designing the electrical system for a vehicle that has 12 brushed dc motors / linear actuators, they are driven by 6 identical dual-channel motor driver boards, that provide a maximum ...
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### torque required to rotate a linear actuator slide [closed]

We want to choose stepper motor or servo motor for rotating a linear actuator slide given below which is of weight 5kg. https://www.3dprintronics.com/Linear-Actuator-Ball-Screw-1204-p108536003 The ...
517 views

### How to Find Angle of Armature Current

Two identical three-phase, Y-connected, synchronous generators are connected in parallel to equally share a load of 900 kW at 11 kV and 0.8 pf lagging. The synchronous impedance of each generator is 0....
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Hi i have a BLDC moter https://www.banggood.com/350W-48V-DC-Brushless-Motor-Geared-Ebike-Tricycle-Kit-Engine-Electric-Scooter-p-1419702.html?akmClientCountry=NL&rmmds=cart_middle_products&...
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### How do you drive a variable reluctance stepper/SRM as a generator?

I think I understand the principles, even if not the details, of operating a VR/SRM as a motor. But I don't understand, and can't find any good explanation online of, the principles for how to use one ...
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### VHS(C) tape speed issues - how does the speed change for different modes?

I have a VHS-C camcorder that has a lot of trouble keeping constant speed for the main tape motor (even with the battery fully charged). Most of the time it's way too fast (similar to fast forwarding),...
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### Would the motor reverse if phases swapped for this case?

A servomotor power connection pins are given as follows: U V W are the three phase terminals. Would the motor reverse if I mistakenly swap phases U and V namely if I connect pin 1 to W and pin 3 to U?...
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### Do BLDC and Induction motors have the same efficiency vs. load relation?

In induction motor, the efficiency is maximum for rated load. But for lighter loads, efficiency decreases. I wonder if the same principal applies for BLDC motor also?
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### motor or actuator which fits these specifications [duplicate]

This is a repeat question with more details; As a hobbyist and blissfully ignorant of electrical engineering, I wonder if someone out there is willing to give me some feedback? Is there a battery ...
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### Don't know which transistor I should use

I am new to transistors. I want to know which transistor I should use which will suffice for my H bridge. My motor draws 1.2A at 6V when stalled.
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### Attiny85 crashes when I run a motor through an L293D

I'm trying to run a motor through an L293D turned on and off by an Attiny85. The Attiny85 has the micronucleus bootloader on it, which is why pin 3 is connected to a pull up resistor. On the Attiny ...
395 views

### Relating Hall sensor outputs to absolute rotor position (Which combination corresponds to which angle)

I have a working 6-step BLDC commutation which works based on the Hall effect sensor outputs. I would like to apply the same code to another motor, which doesnt have Hall sensors but an absolute rotor ...
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### Motor Voltage and Current Limit of Brushed DC Motor

What fundamentally limits the applicable voltage in a motor? From what I understand, the input to the motor is a relatively constant impedance (since speed is on the order of 100 Hz) and it is ...
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### Proper Way to Drive this H bridge

MIC4605-2YM Datasheet Given the circuit above what is the proper way to drive this H bridge in a manner where I can change the motor direction. the datasheet shows a sample circuit of a full H bridge ...
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### Why is my DC motor losing torque when over voltaged

I have these small dc TAMIYA motors rated at 3v at around 2-3 amps. I also have a driver that I'm planning to use to drive the motor. https://www.pololu.com/product/2992 I could not find any other ...
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### Can you power ac motor in ev with ac generator? [closed]

Can a smaller ev with ac motor be powered by an ac gen instead of using a battery pack and everything that would go along with it? If so, what would the arrangement be going from gen to motor?
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### How is a higher torque achieved in a single phase cap-start cap-run motor?

The starting winding come capacitor circuit is there for starting the motor. When the motor reaches 80% rated speed, the centrifugal switch cuts the starting circuit out and leaves the run winding ...
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### Motor ESC and Battery Amp Draw

Should your motor have less Amp draw than your ESC or more, and should your ESC have more or less Amp draw than your battery can supply? Thanks!
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### Controlling 12V 12A DC Pump using PIC

For part of my project for college I have co control a 12V DC pump which requires 12A. I was wondering what is the best solution for allowing the PIC to complete this as the output from the PIC is ...
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### How to control BTS7960 43A motor driver directions?

The board has two PWM inputs, see: Do I have to use four pins to control two motors? Thanks
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### Help with modeling a 6-phase motor in Simulink

I'm not sure if I'm posting in the right subsection, however I've recently started working on a project. I have little background on the subject. I've a degree in electronics which mainly focused on ...
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### Synchronous Motor Power and Frequency Relationships

I'm having a difficult time trying to understand what effect the frequency of a power supply has on the power of a synchronous motor. For example, if the supply frequency were to increase from 50Hz ...
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I am doing an experiment that involves loading an asynchronous 50 HZ generator. For the load to consume current it has to be a capacitive load to cause a phase shift between the current and the ...
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### What would i change about this diagram to power and regulate this motor to make this a working model

what if the battery was 12v? would this be a working model? a previous comment suggested a BJT, and to regulate the BJT with a potentiometer.. what is a BJT? i am looking to get as small of ...
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### Stepper Motors (NEMA-17) Won't Run When Wheels Are Attached

My team and I are creating a robot using 4 stepper motors with mecanum wheels and an Arduino Uno. The code appears to be correct, and the motors seem to run just fine on their own, but once we screw ...
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### 3 Phase PMSM Motor Current Measurement: Figuring out the 2 negative terminal currents with 1 positive current measurement

I am trying to implement F.O.C for a PMSM machine with a custom made inverter board. The H-bridges are from Infineon (IFX007T) and they provide current sensing capabilities. The problem is, i need the ...
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### How does force feedback [hardware] work?

Force feedback steering wheels are fairly common, but I don't understand how they work. Specifically, how does a "direct drive"(\$) steering wheel apply a force one way while moving in another ...